**PROBLEM**

Select a single row deep groove ball bearing with the operating cycle listed below, which will have a life of 15000 hours.

Fraction of cycle | Type of load | Radial (N) | Thrust (N) | Speed (RPM) | Service factor |

1/10 | Heavy shocks | 2000 | 1200 | 400 | 3 |

1/10 | Light shocks | 1500 | 1000 | 500 | 1.5 |

1/5 | Moderate shocks | 1000 | 1500 | 600 | 2 |

3/5 | No shock | 1200 | 2000 | 800 | 1 |

Assume:

Inner race rotates

Radial load factor = 1.0

Axial load factor = 1.5

Rotational factor of the bearing = 1

**SOLUTION**

Basic dynamic equivalent radial load,

By considering the radial factors,

Since the rotational factor (V) for most of the bearings is 1, let’s take V=1,

Life of the bearing for fraction of cycles (FC),

So, the equivalent dynamic load,

So, the dynamic load rating,